THERMAL SCIENCE

International Scientific Journal

THE EFFECT OF BOWL-IN-PISTON GEOMETRY LAYOUT ON FLUID FLOW PATTERN

ABSTRACT
In this paper some results concerning the evolution of 3D fluid flow pattern through all four strokes in combustion chambers with entirely different bowl-in-piston geometry layouts ranging from ”omega” to “simple cylinder” were presented. All combustion chambers i.e. those with „omega“ bowls, with different profiles, and those with „cylinder“ bowls, with different squish area ranging from 44% to 62%, were with flat head, vertical valves and identical elevation of intake and exhaust ports. A bunch of results emerged by dint of multidimensional modeling of nonreactive fluid flow in arbitrary geometry with moving objects and boundaries. The fluid flow pattern during induction and compression in all cases was extremely complicated and entirely three-dimensional. It should be noted that significant differences due to geometry of the bowl were encountered only in the vicinity of TDC. Namely, in the case of “omega” bowl all three types of organized macro flows were observed while in the case of “cylinder” bowl no circumferential velocity was registered at all. On the contrary, in the case of “cylinder” bowl some interesting results concerning reverse tumble and its center of rotation shifting from exhaust valve zone to intake valve zone during induction stroke and vice-verse from intake valve zone to exhaust valve zone during compression were observed while in the case of “omega” bowl no such a displacement was legible. During expansion the fluid flow pattern is fully controlled by piston motion and during exhaust it is mainly one-dimensional, except in the close proximity of exhaust valve. For that reason it is not affected by the geometry of the bowl.
KEYWORDS
PAPER SUBMITTED: 2011-04-17
PAPER REVISED: 2011-05-04
PAPER ACCEPTED: 2011-05-06
DOI REFERENCE: https://doi.org/10.2298/TSCI110417040J
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2011, VOLUME 15, ISSUE 3, PAGES [817 - 832]
REFERENCES
  1. Z.Jovanovic, The role of tensor calculus in numerical modeling of combustion in IC Engines, Computer Simulation for Fluid Flow, Heat and Mass Transfer, and Combustion in Reciprocating Engines, pp. 457-541, ISBN 0-89116-392-1, Hemisphere Publishers, 1989
  2. Z.Jovanovic, S.Petrovic, M.Tomic, The effect of macro flows on flame propagation in combustion chamber of IC Engines, YU-97117, pp. 83 - 86, Proceedings of International Symposiu,. Science and Motor Vehicles, Belgrade 1997
  3. Z.Jovanovic, S.Petrovic, 3D fluid flow in IC Engine combustion chamber of arbitrary geometry, Proceedings of International Symposium MOTOAUTO 97, Vol. II, pp.105-110, Russe,ISBN 954-90272-2-8
  4. Z.Jovanovic, S.Petrovic, The mutual interaction between squish and swirl in SI Engine combustion chamber, Mobility and Vehicle Mechanics, pp. 72-86, vol. 23, No.3, 1977
  5. Z.Jovanovic, S.Petrovic, The effect of squish area variation on flame front shape and its displacement, YU-98111, Proceedings of International Symposium, Engine and Motor Vehicles, Kragujevac 1998
  6. Z.Jovanovic, The new fluid flow criterion for the characterization of flame front shape and its displacement, VII International Scientific Conference, Simulation Research in Automotive Engineering, pp. 1-7, Lublin (Poland), 1999
  7. Z.Jovanovic, The modification of the combustion chamber geometry layout on the basis of fluid flow pattern criteria, Proceedings of the International Conference MOTOAUTO 99, pp. 31-37, Plovdiv, Bulgaria, 1999
  8. A.Chen, K.C.Lee, M.Yianneskis, Velocity characteristics of steady flow through a straight generic inlet port, International Journal for Numerical Methods in Fluids, pp. 571-590, vol. 21 (1995)
  9. S.Nadarajah, M.J.Tindal, M.Yianneskis, Swirl centre precession under steady flow conditions, Proceedings IME, C413/065, pp.103-108, 1991
  10. Z.Jovanovic, S.Petrovic, The effect of intake flow modeling on flame front shape and its displacement in cylindrical combustion chamber, Society of Automotive Engineers, SP Publication, Multidimensional engine modeling, pp. 1-6, Detroit, 2001
  11. Z.Jovanovic, The displacement of the reverse tumble centre of rotation during induction and compression, MVM, pp. 29-44, vol. 26, No.1&2, 2000
  12. Z.Jovanovic, S.Petrovic, The effect of tumble on flame front shape and its displacement, International Symposium, Automotive and environment, pp. 153-159, Pitesti, Romaina, 2000
  13. Z.Jovanović, The mutual interaction between squish and tumble in combustion chamber with cylindrical bowl, Inernational Journal for Vehicle Mechanics, Engines and Transportation System, Mobility and Vehicle Mechanics, pp. 19-32, vol. 27, No.1/2, (2001)
  14. Z.Jovanović, B.Basara, The structure of intake flow in 4.-valve engines, YUMV 01022, International Automotive Conference SCIENCE & MOTOR VEHICLES, pp. 97-100, Belgrade, 2001
  15. B.Basara, Z.Jovanović, The current capabilities of turbulence modeling in automotive flows, YUMV 010021, International Automotive Conference SCIENCE & MOTOR VEHICLES pp. 93-96, Belgrade, 2001
  16. Z.Jovanovic, 3D modeling of nonreactive fluid flow in a particular combustion chamber, MVM04-B21, International Scientific Meeting Motor Vehicles and Engines, pp. 551-562, Kragujevac ,2004
  17. Z.Jovanovic, M.Tomic, Modeling of non-reactive fluid flow in a diesel-like combustion chamber, MVM20060068, International Congress Motor Vehicles & Motors, pp. 551-562, Kragujevac, 2006
  18. Z.Masoničić, Z.Jovanović, The effect of combustion chamber geometry layout variations onto fluid flow pattern, JUMV, International Automotive Conference SCIENCE & MOTOR VEHICLES, Belgrade 2007 - Paper NMV0774, ISBN 978-86-80941-31-8
  19. Z.Jovanovic, Z.Masonicic, M.Tomic, The vice-verse movement of the reverse tumble center of rotation in a particular combustion chamber, MTM Machines Technologies Materials, International virtual journal for science, technics and innovations for the industry, Year II, Issue 6-7, 2008, ISSN 1313-0226, p 17-20
  20. Z.Jovanovic, B.Basara, The controversy concerning turbulence modeling in automotive application, paper M13, PCO Global Conference, Kuching, Sarawak, Borneo, Malaysia, December, 2-4, 2010, ISBN 978-983-44483-32
  21. Z.Jovanović, S.Petrović, M.Tomić, The effect of combustion chamber geometry layout on combustion and emission, Thermal Science, vol 12 (2008), No.1, pp. 7-24.
  22. A.D.Gosman, Flow processes in cylinders, The Thermodynamics and Gas Dynamics of IC Engines, pp. 616-772, vol. II, Oxford Science Publications, ISBN 0-19-856212-8, 1986
  23. A.A.Amsden, KIVAII: A computer program for chemically reactive flows with sprays, LA-11560-MS,1989
  24. A.A.Amsden, KIVA3V, Rel.2-Improvements to KIVA3V, LA-UR-99-915, 1999
  25. A.A.Amsden, SALE3D: A simplified ALE computer program for calculating 3D fluid flows, NUREG-CR-2185, 1982, 11560-MS, 1989
  26. D.J.Torres, M.F.Trujillo, KIVA-4: An unstructured ALE code for compressible gas flow with sprays, Journal of Computational Physics (2006), pp.943-975

© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence